drivers/usb/host/ehci-orion.c

   1 /*
   2  * drivers/usb/host/ehci-orion.c
   3  *
   4  * Tzachi Perelstein <tzachi@marvell.com>
   5  *
   6  * This file is licensed under  the terms of the GNU General Public
   7  * License version 2. This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mbus.h>
  15 #include <linux/clk.h>
  16 #include <linux/platform_data/usb-ehci-orion.h>
  17 #include <linux/of.h>
  18 #include <linux/phy/phy.h>
  19 #include <linux/of_device.h>
  20 #include <linux/of_irq.h>
  21 #include <linux/usb.h>
  22 #include <linux/usb/hcd.h>
  23 #include <linux/io.h>
  24 #include <linux/dma-mapping.h>
  25
  26 #include "ehci.h"
  27
  28 #define rdl(off)        readl_relaxed(hcd->regs + (off))
  29 #define wrl(off, val)   writel_relaxed((val), hcd->regs + (off))
  30
  31 #define USB_CMD                 0x140
  32 #define   USB_CMD_RUN           BIT(0)
  33 #define   USB_CMD_RESET         BIT(1)
  34 #define USB_MODE                0x1a8
  35 #define   USB_MODE_MASK         GENMASK(1, 0)
  36 #define   USB_MODE_DEVICE       0x2
  37 #define   USB_MODE_HOST         0x3
  38 #define   USB_MODE_SDIS         BIT(4)
  39 #define USB_CAUSE               0x310
  40 #define USB_MASK                0x314
  41 #define USB_WINDOW_CTRL(i)      (0x320 + ((i) << 4))
  42 #define USB_WINDOW_BASE(i)      (0x324 + ((i) << 4))
  43 #define USB_IPG                 0x360
  44 #define USB_PHY_PWR_CTRL        0x400
  45 #define USB_PHY_TX_CTRL         0x420
  46 #define USB_PHY_RX_CTRL         0x430
  47 #define USB_PHY_IVREF_CTRL      0x440
  48 #define USB_PHY_TST_GRP_CTRL    0x450
  49
  50 #define DRIVER_DESC "EHCI orion driver"
  51
  52 #define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)
  53
  54 struct orion_ehci_hcd {
  55         struct clk *clk;
  56         struct phy *phy;
  57 };
  58
  59 static const char hcd_name[] = "ehci-orion";
  60
  61 static struct hc_driver __read_mostly ehci_orion_hc_driver;
  62
  63 /*
  64  * Implement Orion USB controller specification guidelines
  65  */
  66 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
  67 {
  68         /* The below GLs are according to the Orion Errata document */
  69         /*
  70          * Clear interrupt cause and mask
  71          */
  72         wrl(USB_CAUSE, 0);
  73         wrl(USB_MASK, 0);
  74
  75         /*
  76          * Reset controller
  77          */
  78         wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
  79         while (rdl(USB_CMD) & USB_CMD_RESET);
  80
  81         /*
  82          * GL# USB-10: Set IPG for non start of frame packets
  83          * Bits[14:8]=0xc
  84          */
  85         wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);
  86
  87         /*
  88          * GL# USB-9: USB 2.0 Power Control
  89          * BG_VSEL[7:6]=0x1
  90          */
  91         wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);
  92
  93         /*
  94          * GL# USB-1: USB PHY Tx Control - force calibration to '8'
  95          * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
  96          */
  97         wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);
  98
  99         /*
 100          * GL# USB-3 GL# USB-9: USB PHY Rx Control
 101          * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
 102          * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
 103          */
 104         wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);
 105
 106         /*
 107          * GL# USB-3 GL# USB-9: USB PHY IVREF Control
 108          * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
 109          */
 110         wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);
 111
 112         /*
 113          * GL# USB-3 GL# USB-9: USB PHY Test Group Control
 114          * REG_FIFO_SQ_RST[15]=0
 115          */
 116         wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);
 117
 118         /*
 119          * Stop and reset controller
 120          */
 121         wrl(USB_CMD, rdl(USB_CMD) & ~USB_CMD_RUN);
 122         wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
 123         while (rdl(USB_CMD) & USB_CMD_RESET);
 124
 125         /*
 126          * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
 127          * TBD: This need to be done after each reset!
 128          * GL# USB-4 Setup USB Host mode
 129          */
 130         wrl(USB_MODE, USB_MODE_SDIS | USB_MODE_HOST);
 131 }
 132
 133 static void
 134 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
 135                              const struct mbus_dram_target_info *dram)
 136 {
 137         int i;
 138
 139         for (i = 0; i < 4; i++) {
 140                 wrl(USB_WINDOW_CTRL(i), 0);
 141                 wrl(USB_WINDOW_BASE(i), 0);
 142         }
 143
 144         for (i = 0; i < dram->num_cs; i++) {
 145                 const struct mbus_dram_window *cs = dram->cs + i;
 146
 147                 wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
 148                                         (cs->mbus_attr << 8) |
 149                                         (dram->mbus_dram_target_id << 4) | 1);
 150                 wrl(USB_WINDOW_BASE(i), cs->base);
 151         }
 152 }
 153
 154 static const struct ehci_driver_overrides orion_overrides __initconst = {
 155         .extra_priv_size =      sizeof(struct orion_ehci_hcd),
 156 };
 157
 158 static int ehci_orion_drv_probe(struct platform_device *pdev)
 159 {
 160         struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
 161         const struct mbus_dram_target_info *dram;
 162         struct resource *res;
 163         struct usb_hcd *hcd;
 164         struct ehci_hcd *ehci;
 165         void __iomem *regs;
 166         int irq, err;
 167         enum orion_ehci_phy_ver phy_version;
 168         struct orion_ehci_hcd *priv;
 169
 170         if (usb_disabled())
 171                 return -ENODEV;
 172
 173         pr_debug("Initializing Orion-SoC USB Host Controller\n");
 174
 175         irq = platform_get_irq(pdev, 0);
 176         if (irq <= 0) {
 177                 dev_err(&pdev->dev,
 178                         "Found HC with no IRQ. Check %s setup!\n",
 179                         dev_name(&pdev->dev));
 180                 err = -ENODEV;
 181                 goto err;
 182         }
 183
 184         /*
 185          * Right now device-tree probed devices don't get dma_mask
 186          * set. Since shared usb code relies on it, set it here for
 187          * now. Once we have dma capability bindings this can go away.
 188          */
 189         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 190         if (err)
 191                 goto err;
 192
 193         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 194         regs = devm_ioremap_resource(&pdev->dev, res);
 195         if (IS_ERR(regs)) {
 196                 err = PTR_ERR(regs);
 197                 goto err;
 198         }
 199
 200         hcd = usb_create_hcd(&ehci_orion_hc_driver,
 201                         &pdev->dev, dev_name(&pdev->dev));
 202         if (!hcd) {
 203                 err = -ENOMEM;
 204                 goto err;
 205         }
 206
 207         hcd->rsrc_start = res->start;
 208         hcd->rsrc_len = resource_size(res);
 209         hcd->regs = regs;
 210
 211         ehci = hcd_to_ehci(hcd);
 212         ehci->caps = hcd->regs + 0x100;
 213         hcd->has_tt = 1;
 214
 215         priv = hcd_to_orion_priv(hcd);
 216         /*
 217          * Not all platforms can gate the clock, so it is not an error if
 218          * the clock does not exists.
 219          */
 220         priv->clk = devm_clk_get(&pdev->dev, NULL);
 221         if (!IS_ERR(priv->clk))
 222                 clk_prepare_enable(priv->clk);
 223
 224         priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
 225         if (IS_ERR(priv->phy)) {
 226                 err = PTR_ERR(priv->phy);
 227                 if (err != -ENOSYS)
 228                         goto err_phy_get;
 229         } else {
 230                 err = phy_init(priv->phy);
 231                 if (err)
 232                         goto err_phy_init;
 233
 234                 err = phy_power_on(priv->phy);
 235                 if (err)
 236                         goto err_phy_power_on;
 237         }
 238
 239         /*
 240          * (Re-)program MBUS remapping windows if we are asked to.
 241          */
 242         dram = mv_mbus_dram_info();
 243         if (dram)
 244                 ehci_orion_conf_mbus_windows(hcd, dram);
 245
 246         /*
 247          * setup Orion USB controller.
 248          */
 249         if (pdev->dev.of_node)
 250                 phy_version = EHCI_PHY_NA;
 251         else
 252                 phy_version = pd->phy_version;
 253
 254         switch (phy_version) {
 255         case EHCI_PHY_NA:       /* dont change USB phy settings */
 256                 break;
 257         case EHCI_PHY_ORION:
 258                 orion_usb_phy_v1_setup(hcd);
 259                 break;
 260         case EHCI_PHY_DD:
 261         case EHCI_PHY_KW:
 262         default:
 263                 dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
 264         }
 265
 266         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 267         if (err)
 268                 goto err_add_hcd;
 269
 270         device_wakeup_enable(hcd->self.controller);
 271         return 0;
 272
 273 err_add_hcd:
 274         if (!IS_ERR(priv->phy))
 275                 phy_power_off(priv->phy);
 276 err_phy_power_on:
 277         if (!IS_ERR(priv->phy))
 278                 phy_exit(priv->phy);
 279 err_phy_init:
 280 err_phy_get:
 281         if (!IS_ERR(priv->clk))
 282                 clk_disable_unprepare(priv->clk);
 283         usb_put_hcd(hcd);
 284 err:
 285         dev_err(&pdev->dev, "init %s fail, %d\n",
 286                 dev_name(&pdev->dev), err);
 287
 288         return err;
 289 }
 290
 291 static int ehci_orion_drv_remove(struct platform_device *pdev)
 292 {
 293         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 294         struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);
 295
 296         usb_remove_hcd(hcd);
 297
 298         if (!IS_ERR(priv->phy)) {
 299                 phy_power_off(priv->phy);
 300                 phy_exit(priv->phy);
 301         }
 302
 303         if (!IS_ERR(priv->clk))
 304                 clk_disable_unprepare(priv->clk);
 305
 306         usb_put_hcd(hcd);
 307
 308         return 0;
 309 }
 310
 311 static const struct of_device_id ehci_orion_dt_ids[] = {
 312         { .compatible = "marvell,orion-ehci", },
 313         {},
 314 };
 315 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
 316
 317 static struct platform_driver ehci_orion_driver = {
 318         .probe          = ehci_orion_drv_probe,
 319         .remove         = ehci_orion_drv_remove,
 320         .shutdown       = usb_hcd_platform_shutdown,
 321         .driver = {
 322                 .name   = "orion-ehci",
 323                 .of_match_table = ehci_orion_dt_ids,
 324         },
 325 };
 326
 327 static int __init ehci_orion_init(void)
 328 {
 329         if (usb_disabled())
 330                 return -ENODEV;
 331
 332         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 333
 334         ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
 335         return platform_driver_register(&ehci_orion_driver);
 336 }
 337 module_init(ehci_orion_init);
 338
 339 static void __exit ehci_orion_cleanup(void)
 340 {
 341         platform_driver_unregister(&ehci_orion_driver);
 342 }
 343 module_exit(ehci_orion_cleanup);
 344
 345 MODULE_DESCRIPTION(DRIVER_DESC);
 346 MODULE_ALIAS("platform:orion-ehci");
 347 MODULE_AUTHOR("Tzachi Perelstein");
 348 MODULE_LICENSE("GPL v2");